GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Hydraulic Brake Diagnostic System Check performed?

--

Go to Step 2

Go to Hydraulic Brake Diagnostic System Check

2

Inspect the brake pedal assembly for the following conditions:

    • Bent or misaligned components
    • Binding or interference between the pedal and booster input rod

Are the components misaligned or binding?

--

Go to Step 3

Go to Step 4

3

Repair or replace the cause of misalignment, interference or binding.

Is the repair complete?

--

Go to Step 12

--

4

Inspect the disc brake pads for the following conditions:

    • Excessive wear
    • Uneven wear
    • Abuse
    • Glazing
    • Contaminated lining material
    • Incorrect lining material

Refer to Brake Pad Inspection in Disc Brakes.

Do any of the above conditions apply?

--

Go to Step 5

Go to Step 6

5

Replace the brake linings. Refer to Front Disc Brake Pads Replacement or Rear Disc Brake Pads Replacement in Disc Brakes.

Is the repair complete?

--

Go to Step 12

--

6

Inspect the brake rotor for the following conditions:

    • Hot spots
    • Scored rotor surface
    • Grooved rotor surface

Refer to the appropriate procedure in Disc Brakes:

    •  Brake Rotor Tolerance

Do any of the above conditions apply?

--

Go to Step 7

Go to Step 8

7

  1. Refinish the brake rotor. Refer to Brake Rotor Refinishing in Disc Brakes.
  2. If refinishing the brake rotor results in a thickness that is less than the thinnest (Refinishing) thickness, replace the rotor. Refer to Front Brake Rotor Replacement or Rear Brake Rotor Replacement in Disc Brakes.

Is the repair complete?

--

Go to Step 12

--

8

Check the master cylinder outlet ports for restricted passages. Refer to Hydraulic Brake System Bleeding .

Are the outlet ports restricted?

--

Go to Step 9

Go to Step 10

9

  1. Overhaul the master cylinder. Refer to Master Cylinder Overhaul .
  2. Flush the hydraulic brake system. Refer to Hydraulic Brake System Flushing .

Is the repair complete?

--

Go to Step 12

--

10

Check the brake pipes and hoses for the following conditions:

    • Low fluid or no fluid output
    • Spurting of fluid while pressing the brake pedal
    • Particles suspended in the fluid

Refer to Hydraulic Brake System Flushing .

Do any of the above conditions apply?

--

Go to Step 11

System OK

11

  1. Determine the area of the restriction. This will involve the disassembly of individual brake lines and checking for low or no fluid output.
  2. Flush the individual brake line or hose. Refer to Hydraulic Brake System Flushing .
  3. If the restriction cannot be removed, replace the brake hose or pipe as necessary. Refer to the appropriate procedure:
  4. Flush the hydraulic brake system. Refer to Hydraulic Brake System Flushing .

Is the repair complete?

--

Go to Step 12

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12

Verify proper brake system operation.

Does the original condition still exist?

--

Go to Step 1

System OK